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A154087 Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 5 X 5 X 5 subtriangle summing to 12. 0
22, 40, 80, 53, 27, 67, 30, 17, 28, 9, 10, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

COMMENTS

Pattern 6 9 9 9 9 starts at n=16 and continues through at least n=51.

LINKS

Table of n, a(n) for n=5..51.

EXAMPLE

Maximal zeros solution for n=16

.................6

................0.0

...............0.0.0

..............0.2.2.0

.............0.0.2.0.0

............4.1.0.0.1.4

...........0.1.0.2.0.1.0

..........0.0.0.2.2.0.0.0

.........0.2.2.0.0.0.2.2.0

........0.0.2.0.1.1.0.2.0.0

.......4.1.0.0.1.2.1.0.0.1.4

......0.1.0.2.0.1.1.0.2.0.1.0

.....0.0.0.2.2.0.0.0.2.2.0.0.0

....0.2.2.0.0.0.2.2.0.0.0.2.2.0

...0.0.2.0.1.1.0.2.0.1.1.0.2.0.0

..6.0.0.0.0.4.0.0.0.0.4.0.0.0.0.6

CROSSREFS

Sequence in context: A188156 A026061 A138040 * A063327 A066957 A118602

Adjacent sequences:  A154084 A154085 A154086 * A154088 A154089 A154090

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)